One thing I see come up from time to time in submissions we get from associates is the complaint that studio managers steal all the good sales.
I've gotta say, as an assistant, this was something I did. I had to. The company constantly put me in the place where I always felt that if my sales didn't go up by an average 10 dollars that week, I would be in danger of being fired.
So when a new associate came in who obviously wasn't going to last more than two weeks (hint: 95% of them) and they happen to make a $200 sale of photos I took while doing sales training, of course I'm going to enter my code in the register. This will result in the associate's average not being as good, but they have a lot of leeway during the first couple weeks. I would never take credit for a later sale when their PRS really starts to count for their own job security, but early on, who wouldn't? You've gotta do whatever it takes when it feels like you might lose your job.
If only everyone didn't always feel of the brink of being let go.